第8题:
问答题
Is There Life on Mars? The American space agency, NASA (the National Aeronautics and Space Administration), has drawn up a short list of ten research projects that will form the basic of an ambitious program to explore the planet Mars in a mission scheduled for launch in 2007. Scientists are being asked to use their ingenuity to devise novel ways to explore the red planet using intelligent robots and probes that might perhaps answer the biggest question of all—-is there life on Mars? NASA chose the ten projects from a list of 43 hopefuls. It has included missions for returning samples of Martian dust and gas to Earth, networks of small landers, orbiting constellations of microprobes and a rover that would try to date the precise age of rocks and soils. The ten concepts are part of the Mars Scout program to be launched in six years. This follows a decade of the most intensive interest in Mars since the two Viking probes of 1976 which sent back eerie images of the Martian landscape some 400 million kilometers away. But the history of Mars exploration is littered with failure—more than half of the 30 missions to date have ended in fiasco. It was NASA’s announcement in August 1996 of possible signs of life in a Martian meteorite which had fallen to Earth that rekindled intense interest in Earth’s nearest neighbor. It was assumed that liquid water had once flowed on Mars and an ancient atmosphere might have supported living organisms. However, opposing camps of scientists bitterly disputed NASA’s evidence for primitive life-forms in the Martian meteorite ALH84001. This led to the conclusion that the only way of finding out whether life ever existed on Mars is to go there and have a look. NASA planned a bold series of increasingly complex missions involving the launch of a couple of space probes every year for a dozen years. One of the most successful so far was the shoe-box-sized So-journer rover which thrilled a world Internet audience when it was wheeled out in 1997. Since then, however, NASA has suffered a series of setbacks. In September 1999 its Mars Climate Orbiter was lost as a failed rocket bum plunged it into the Martian atmosphere. NASA blamed it on one of its team using imperial units and another using metric. Three months later, NASA lost contact with its Polar Lander as it approached touchdown on the frozen South Pole of the planet. Space commentators muttered darkly about Mars being a cosmic equivalent of the Bermuda triangle. The year of 2001 saw the successful completion of the Global Surveyor mission, an orbiting probe that took pictures of what some scientists say are channels in the dust where water may still occasionally flow from underground well. More recently, the Mars Odyssey probe was launched without hitch and is due to arrive in 2008. Meanwhile, the European Space Agency is planning its own visit to the red planet with the launch of its Mars Express mission scheduled for take-off in .June 2003. Britain is designated to take a lead role in the project with the Beagle 2 Lander, a small craft, the size of a kitchen sink designed to shuffle over the Martian landscape taking soil and rock samples, analyzing them for signs of life and transmitting the data back to Earth. Beagle 2—framed after the ship that carded Charles Darwin on his voyage of discovery—will weigh just 60 kilograms and will cost about US $225,000 to build, a fraction of the cost of building the Viking space probes more than 25 years ago. Beagle 2 will look for water, minerals and organic matter. Although it will reach Mars before NASA’s Scout mission is even launched, it will be considerably less sophisticated in tea’ms of analytical technology. The focus now for NASA is on what instruments and robots to put on the Mars Scout mission in six years. Ed Weiler, NASA’s associate administrator for space science, had to decide on a top ten to concentrate NASA’s limited resources. Each project is to receive a grant of $150,000 to see them through the next six months of development. It all has to come out of a total project budget capped at $300 million. These Scout concepts embody the spirit I first thought about more than a year ago; and will enable us to explore the diversity of Mars in new ways, Dr Weiler said.
正确答案:
【参考译文】
火星上有生物吗? 美国航天机构——国家航空航天局(NASA)已制定出一个包括10个研究项目的简表,这些研究是针对一项雄心勃勃的计划而制定的,该计划将在2007年的一次发射任务中对火星进行探测。科学家们纷纷发挥他们的创造性,寻求新思路,利用智能机器人和探测器来探索这颗红色的行星。“火星上有生物吗?”我们也许能给这个首要问题找到答案。
美国国家航空及太空总署从43个可行计划中挑选出这10个项目。其中包括:将火星尘埃和气体的样品带回地球,建立小型登陆器网,将微型探测器卫星群送入轨道,以及建造一台能精确确认岩石和土壤年份的探测车。这10个“创新项目”是今后六年将开展的“火星探测计划”的组成部分。1976年,两只“海盗”探测器发回了距地球4亿公里以外火星景观的怪异图像,自此,人们就对火星产生了浓厚的兴趣。“火星探测计划”是这十年来浓厚兴趣的延续。
然而,火星探测的历史也经历了重重的失败。迄今为止,30多次的探测有一多半均以失败告终。1996年8月,美国国家航空及太空总署宣布,落到地球上的火星陨石中可能存在生命迹象,这一发现重新燃起了人们对火层——这颗离地球最近的星球一的浓厚兴趣。人们推断火星上也曾流淌过河流,远古的大气下可能也曾有生命体的存在。然而,反对阵营的科学家们很不认同火星陨石ALH84001中存在初级生物的证据。因此,要想知道火星上是否存在过生物,唯一的办法就是到那里去看一下。
美国国家航空及太空总署大胆出台了一系列日益复杂的计划,包括连续12年每年发射几个太空探测器。“寄居者”探测器是迄今为止最为成功的尝试,它只有一个鞋盒大小。它于1997年的面世震惊了全世界的互联网观众。但是从那以后,美国国家航空及太空总署就遭遇了一系列的挫折。
1999年9月,由于运载火箭出现事故,火星气候轨道探测器在燃烧后消失在火星的大气层中。美国国家航空及太空总署将这次事故归咎于使用了英制和公制两种不同的单位。三个月后,美国国家航空及太空总署又与其在冰冻的火星南极着陆的“极地登陆者”号探测器失去了联系。当时,太空评论员们丧气地评价说:“火星简直就是宇宙中的百慕大。”
2001年,“星球探测者”号探测器成功完成了使命。它在沿轨道飞行的过程中拍下了一些照片。一些科学家们称他们从中看到了干涸的水渠,地下的泉水也许依然在流淌。较近时候,“火星流浪者”号探测器成功发射,并将于2008年抵达火星。
与此同时,欧洲航天局也在筹划着对火星的访问。按日程安排,“火星特快”号探测器将于2003年6月发射。英国推出“猎犬2号”登陆器,从而占据了领先地位。“猎犬2号”是一种小型飞船,大概有厨房洗涤槽大小。它可以在火星表面移动,搜集土壤和岩石标本,分析其中的生命迹象并将分析资料发回地球。“猎犬2号”是以查尔斯·达尔文曾经乘坐过的考察船而命名,它的重量只有60千克,制造费用约为22.5万美元,与25年前的“海盗”太空探测器相比,只占其成本的很小一部分。
“猎犬2号”将在火星上寻找水、矿物和有机物。尽管它将在美国国家航空及太空总署发射“观察者”号之前就到达火星,但就分析技术而言,它还不够精密。美国国家航空及太空总署目前的工作重心是:在六年内确定要把哪些仪器和机器人装载到“火星观察者”号上。为能够集中利用总署的有限资源,美国国家航空及太空总署中主管太空科学的副局长埃德·韦勒只得将注意力集中到以上提到的10个研究项目上。
每个项目将会得到l5万美元的资助,确保其在今后六个月的开发。未来项目总额预计会达到3亿美元。韦勒博士说,“‘观察者号’的这些构想体现了我一年多以前的理念,它们将为我们提供新的方式来探测火星的多变情况。”
解析:
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